Spencer, a first-round draft choice by the Cowboys in 2007, has played linebacker and defensive end during eight NFL seasons.
Last season, Spencer played defensive end as he returned from a knee injury that sidelined him for most of 2013. He was credited with 25 tackles, half a sack, a forced fumble and a fumble recovery that he returned for a touchdown.
In 2012, Spencer was a Pro Bowl linebacker after recording career-highs in tackles with 106 and sacks with 11, along with two forced fumbles and a fumble recovery.
That season, Spencer's defensive coordinator was Rob Ryan, who has held the same position in New Orleans since 2013.
AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL